Set-top box



FIG. 1 is a front perspective view of a set-top box showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown in the drawings show unclaimed subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a set-top box, as shown and described. 